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单项选择题

A.shared ephone-dn B.overlaid ephone-dn C.oual-line eph……

Refer to the exhibit. Which ephone-dn type does Phone 10 represent?()



A.shared ephone-dn 
B.overlaid ephone-dn 
C.oual-line ephone-dn 
D.single-line ephone-dn 
E.dual-number ephone-dn 
F.two ephone-dns with one number

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